Helical anchor



FIG. 1 is a top left perspective view of a helical anchor showing theclaimed design;

FIG. 2 is a top right perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left view thereof;

FIG. 8 is a right view thereof;

FIG. 9 is a top left perspective view of a helical anchor showing theclaimed design;

FIG. 10 is a top right perspective view thereof;

FIG. 11 is a front view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a top view thereof;

FIG. 14 is a bottom view thereof;

FIG. 15 is a left view thereof; and,

FIG. 16 is a right view thereof.

Portions of the helical anchor that are not shown form no part of theclaimed design.

The dashed broken lines in the figures show portions of the helicalanchor that form no part of the claimed design.

CLAIM The ornamental design for a helical anchor, substantially as shownand described.